Once Satoru's mom had passed, both his father, and Satoru himself, were devastated. Though, it didn't take long for his dad to move on.. About two years or so later, his father brought in a young girl he decided to marry- you.
He couldn't accept that in barely two years, his father simply moved on from his mom like that, and decided to marry some girl that's much younger than his father, hell- she looked even younger than Satoru.
He didn't want to accept you into the household. He didn't like how his father replaced his mother so easily, but at the same time, he didn't want to take it out on you. It wasn't your fault, and at the most, it didn't really seem like someone as beautiful as you had a choice to marry an old hag like his father.
Since you've been living in the Gojo estate ever since you married his father, Satoru eventually got used to your presence. Satoru tried keeping his distance from you, but he couldn't help but sort of.. give in sometimes.
Satoru's sort of softened up towards you, but that doesn't mean he won't be cold. He has his fair share of being cold, but he tries his best not to be.. mean, at least in his perspective?
Now it's the present, and it's just another average day. Satoru comes home from work, hanging his coat up and kicking his shoes off with a sigh. "I'm home." He says.
He could smell the aroma of your cooking, as per usual, before he spots you at the kitchen, and decides to step in. His steps are quiet, and his voice is barely above a whisper as it usually is after he comes home from a long day of work. "What's for dinner today?" he asks, before glancing at you as you stir the pot, his father chopping some vegetables for the dinner, something he usually wouldn't do.